GaAs delta-doped quantum wire superlattice characterization by quantum Hall effect and Shubnikov de Haas oscillations

TL;DR

This study investigates the electronic properties of GaAs delta-doped quantum wire superlattices using quantum Hall and Shubnikov de Haas effects, revealing quantum behavior and effective mass coherence in high magnetic fields.

Contribution

It demonstrates the observation of quantum Hall and SdH oscillations in 1D quantum wire superlattices, providing insights into their quantum electronic properties and mass tensor effects.

Findings

Observation of quantum Hall effect and SdH oscillations up to 35 T

Effective masses consistent with magnetophonon measurements

Field rotation affects resonance frequencies due to mass tensor changes

Abstract

Quantum wire superlattices (1D) realized by controlled dislocation slipping in quantum well superlattices (2D) (atomic saw method) have already shown magnetophonon oscillations. This effect has been used to investigate the electronic properties of such systems and prove the quantum character of the physical properties of the wires. By cooling the temperature and using pulsed magnetic field up to 35 T, we have observed both quantum Hall effect (QHE) and Shubnikov de Haas (SdH) oscillations for various configurations of the magnetic field. The effective masses deduced from the values of the fundamental fields are coherent with those obtained with magnetophonon effect. The field rotation induces a change in the resonance frequencies due to the modification of the mass tensor as in a (3D) electron gas. In view the QHE, the plateaus observed in rho_yz are dephased relatively to rho_zz minima which seems to be linked to the dephasing of the minima of the density of states of the broadened Landau levels.